As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE GEAR DISAGREE ON TAKEOFF. THE NOSE GEAR WAS IN THE DOWN POSITION. COMPLIED WITH QRH PROCEDURE. RETURNED TO FIELD. (FLT 5109) FO: 02/28/2019 CLOSED PERFORMED A FULL STRUT SERVICE ON THE NLG IAW AMM. SWUNG THE NLG SEVERAL TIMES IAW AMM. OPS CHECKS GOOD.